Foreigners who travel temporary to Peru for business related reasons that do not include actual labor or gainful employment have to apply for a business visa at a Peruvian consulate before entering the country or, if they can travel visa-free, must make sure to enter the country as a business traveler (negocio) and not as a tourist.
So, if you plan to visit Peru for business such as any sort of business activity of commercial or professional nature, establishing business contacts, exploring business opportunities, taking part in meetings, signing contracts or agreements, making business related financial transactions, etc. you have to enter Peru as a business traveler.